It looks like you did not leave that W7 Shell install to the defaults it presented. So, the path has its default and this is not to be changed. Can it be that ?
I guess this must have been the issue. Yesterday the shell programm could not find the Path to my W7 source I presented during the installation so I directed it to the W7 still present on the HDD (Dual Boot) which was accepted. I can't remember that I did changed the path to where the program files has to be installed though...
This morning after reading your last reply I uninstalled the shell program, restarted W8 and installed it again (all under normal OS conditions).
This time there was no problems finding anything (auto search for W7) and things installed fine again and the old Windows 7 shell came up as selected after logging on again.
So far so good...
Now the question if this all changed anything for the better and started a track unattended...
... the track just stopped and pretty quickly XX came back in normal conditions again!
Pfheww, thanks for your clever thoughts about this annoying issue, problem solved!
Bert